(NZ) Cat cull hurt native petrels, study finds

A New Zealand study has turned conventional wisdom on its head, after a cull of wild cats on an island actually harmed a native bird population.

A recent report in the Proceedings of the National Academy of Sciences found a bid by the Department of Conservation (DoC)to remove cats from New Zealand's Little Barrier Island had unintended consequences.

Killing off all the cats in 1980 resulted in a jump in rat numbers, which proved deadly to the local Cook's petrel population.
 
Cook's petrels are small burrow-dwelling birds that are abundant on the island, but have disappeared from mainland New Zealand.

When both rats and cats were preying on the petrels 32 per cent of the birds had chicks, but this dropped to just 9 per cent after cats were removed.

The situation in New Zealand is similar to events in Australia's Macquarie Island, which found rabbit and rodent populations exploded after feral cats were eradicated in the 1990s.

Reference: www.theaustralian.news.com.au

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